Click on the thumbnails to enlarge the images

Click here to view an interactive map of the Northern Ireland dataset as currently collated by CEDaR.The map is generated through the NBN Gateway using their Interactive Mapping Tool.

This crustose lichen has a white to pale grey thallus with neat, convex, marginal lobes. It can become covered in soredia a shade darker than the thallus. It is a familiar rosette-forming species in sheltered habitats exposed to nutrient-rich dust. Older specimens often lose their centres, especially on steep, vertical walls and on churchyard headstones. Black discs occur, but are usually uncommon. Frequent on nutrient-rich trees, old buildings and monuments.